Nodal.js vs Pusher

Perfect

A framework for developing web and other REST services in the Swift programming language

Harp

The static web server with built-in preprocessing

Puma

A Ruby/Rack web server built for parallelism

Sanic

A Python web server and web framework that’s written to go fast

Unicorn

Web Servers

Ably

Mobile Push Messaging

OneSignal

Push Notifications

Twilio

A cloud communication platform, which brings voice, telephony, SMS, and messaging functionality to your app

Datadog

A cloud-based monitoring solution for app and infrastructure metrics

Zapier

No-code automation service